538 has their Ipsos before/after debate poll out. Pretty much what you'd assume: Biden performed better, but probably not enough to move any numbers. Biden's favorable rating going from 49 to 52 isn't huge, but might be reluctant Biden supporters getting a little more comfortable with him. Similar movement in the opposite direction for Trump, showing some softening in his support.
https://projects.fivethirtyeight.com...n-debate-poll/